Photography and eyes

(1) The eyeball is like a camera, and the lens and cornea work together like a convex lens. It focuses the light from the object on the retina to form the image of the object, and transmits the signal to the brain through the optic nerve, so that we can see the object and the object becomes an inverted and reduced real image.

(2) The farthest point that the eyes can see clearly is called the apogee, and the apogee of normal eyes is extremely far. The closest point that the eyes can see clearly is called the near point, and the near point of normal eyes is about 10 cm away from the eyes. Therefore, the observation range of normal eyes is 10 cm ~ extremely far.

(3) Myopia is caused by imaging in front of the retina, and myopia should be corrected by concave lens, so Figure A fits the question, and Figure B is the cause of hyperopia; C picture is the cause of myopia; D picture shows the cause and correction of hyperopia.

(4) The photographer found that there were students on both sides who didn't enter the frame, indicating that the taken image was relatively large and should be relatively small. Then the photographer should keep the camera away from the students, increase the object distance and reduce the image distance, in order to get a clear image on the negative. So the length of the camera's black box should be shortened.

So the answer is: (1) handstand; True; (2)C； (3) a; (4) stay away; shorten